EP3902153A1 - Verfahren zur anzeige einer vorcodierungsmatrix und zugehörige vorrichtung - Google Patents

Verfahren zur anzeige einer vorcodierungsmatrix und zugehörige vorrichtung Download PDF

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Publication number
EP3902153A1
EP3902153A1 EP20738094.0A EP20738094A EP3902153A1 EP 3902153 A1 EP3902153 A1 EP 3902153A1 EP 20738094 A EP20738094 A EP 20738094A EP 3902153 A1 EP3902153 A1 EP 3902153A1
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European Patent Office
Prior art keywords
combination
amplitude value
combination coefficient
coefficients
spatial domain
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EP20738094.0A
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English (en)
French (fr)
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EP3902153A4 (de
Inventor
Xiang Gao
Kunpeng Liu
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0658—Feedback reduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity

Definitions

  • This application relates to the field of communications technologies, and in particular, to a precoding matrix indication method and a related device.
  • Massive MIMO Massive Multiple Input Multiple Output
  • spectral efficiency can be significantly improved by using a large-scale antenna, and accuracy of channel state information obtained by a base station determines performance of massive MIMO to a great extent. Therefore, a codebook is usually used to quantize the channel state information.
  • the codebook is used to quantize the channel state information, an original channel feature needs to be approximated as much as possible with allowable overheads, so that channel quantization is more accurate.
  • a significant performance advantage may be obtained by performing linear combination on a plurality of orthogonal beams by using a high-precision codebook.
  • W 1 is a spatial domain beam base vector matrix including the L spatial domain beam base vectors
  • W 3 is a frequency-domain base vector matrix including the M frequency-domain base vectors
  • W ⁇ is a combination coefficient matrix obtained after linear combination is performed on the L spatial domain beam base vectors and the M frequency-domain base vectors.
  • This application provides a precoding matrix indication method and a related device, to help reduce reporting overheads while minimizing a performance loss.
  • this application provides a precoding matrix indication method.
  • a transmit end determines an amplitude value of each of K combination coefficients corresponding to each spatial layer, where the amplitude value of each combination coefficient is determined by using a same amplitude quantization bit quantity and a same amplitude quantization rule; further, the transmit end may further group the K combination coefficients based on the amplitude value of each combination coefficient, to obtain Q combination coefficient groups, where Q is an integer greater than or equal to 2; the transmit end determines a phase value of each combination coefficient in each combination coefficient group, where phase quantization bit quantities and/or phase quantization rules used by at least two of the Q combination coefficient groups are different; and further, the transmit end may send precoding matrix indication information, where the precoding matrix indication information includes the amplitude value and the phase value of each of the K combination coefficients.
  • the K combination coefficients are some or all of corresponding combination coefficients obtained through linear combination of L spatial domain beam base vectors and M frequency-domain base vectors that correspond to one spatial layer, and K is a positive integer less than or equal to L*M.
  • Space-domain beam base vectors and frequency-domain base vectors that correspond to the spatial layers may be the same, or may be different.
  • the K combination coefficients corresponding to each spatial layer may be reported by using the precoding matrix indication method in this application. In this application, how to report K combination coefficients corresponding to one spatial layer is used as an example for description.
  • the amplitude value of each combination coefficient is determined by using the same amplitude quantization bit quantity and the same amplitude quantization rule, so that the transmit end does not need to additionally indicate a grouping status of the K combination coefficients, and a receive end can determine the grouping status based on the amplitude value of each combination coefficient.
  • the phase quantization bit quantities and/or the phase quantization rules used by the at least two of the Q combination coefficient groups are different, thereby facilitating use of different phase quantization precision based on different degrees of impact of different combination coefficient groups on performance, and further helping reduce reporting overheads while minimizing a performance loss.
  • values of L, M, Q, and K may be determined through predefinition or through notification by using signaling. That is, the values of the foregoing parameters are known to both the transmit end and the receive end.
  • that the transmit end groups the K combination coefficients based on the amplitude value of each of the K combination coefficients, to obtain the Q combination coefficient groups may include: The transmit end groups the K combination coefficients based on a descending order or ascending order of the amplitude values of all of the K combination coefficients, to obtain the Q combination coefficient groups. For example, the K combination coefficients are arranged in descending or ascending order of the amplitude values, and the K arranged combination coefficients are grouped, to obtain the Q combination coefficient groups.
  • this implementation facilitates use of different phase quantization precision based on different degrees of impact of different combination coefficient groups on performance, and further helps reduce reporting overheads while minimizing a performance loss.
  • a phase quantization bit quantity and a phase quantization rule that are used by a combination coefficient group with a larger minimum amplitude value, a larger amplitude value sum, or a larger maximum amplitude value correspond to a quantization method with higher quantization precision; and a phase quantization bit quantity and a phase quantization rule that are used by a combination coefficient group with a smaller minimum amplitude value, a smaller amplitude value sum, or a smaller maximum amplitude value correspond to a quantization method with lower quantization precision, thereby reducing reporting overheads while minimizing a performance loss.
  • Quantities of combination coefficients included in the combination coefficient groups may be the same, or may be different.
  • each of the first combination coefficient group to a (Q-1) th combination coefficient group may include ⁇ K / Q ⁇ combination coefficients, and a Q th combination coefficient group includes K - ⁇ K / Q ⁇ ( Q -1) combination coefficients.
  • the first combination coefficient group includes ⁇ K / Q ⁇ combination coefficients with largest amplitude values in the K combination coefficients;
  • the Q th combination coefficient group includes K - ⁇ K / Q ⁇ ( Q -1) combination coefficients with smallest amplitude values in the K combination coefficients; and if Q is an integer greater than or equal to 3, a q th combination coefficient group includes ⁇ K / Q ⁇ combination coefficients with largest amplitude values other than ⁇ K / Q ⁇ * (q-1) combination coefficients with largest amplitude values in the K combination coefficients, and q is an integer greater than 1 and less than Q.
  • a plurality of combination coefficients with same amplitude values may be grouped based on indexes of spatial domain beam base vectors corresponding to the plurality of combination coefficients or indexes of frequency-domain base vectors corresponding to the plurality of combination coefficients.
  • a part of combination coefficients with a larger or smaller index of a corresponding spatial domain beam base vector or frequency-domain beam base vector in the plurality of combination coefficients may be grouped into the combination coefficient group with the larger amplitude value, and the other part may be grouped into the combination coefficient group with the smaller amplitude value.
  • the part with the larger or smaller index of the corresponding frequency-domain beam base vector or spatial domain beam base vector may be further grouped into the combination coefficient group with the larger amplitude value, and the other part may be further grouped into the combination coefficient group with the smaller amplitude value.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the combination coefficients in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the combination coefficients in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in the first combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in the second combination coefficient group; and a phase quantization bit quantity used by phase values of the combination coefficients in the first combination coefficient group is greater than a phase quantization bit quantity used by phase values of the combination coefficients in the second combination coefficient group.
  • the first combination coefficient group includes the combination coefficients with larger amplitude values, and has greater impact on system performance, quantization precision of the first combination coefficient group is higher, and quantization precision of the second combination coefficient group is lower. In this way, in this implementation, system overheads can be reduced while a system performance loss is minimized.
  • that the transmit end groups the K combination coefficients based on the amplitude value of each of the K combination coefficients, to obtain the Q combination coefficient groups includes: The transmit end determines, in the K combination coefficients, one or more combination coefficients corresponding to each of l spatial domain beam base vectors, where l is a positive integer less than or equal to L; the transmit end groups the l spatial domain beam base vectors based on a descending order or ascending order of sum of amplitude value(s), a maximum amplitude value, or a sum of power of the one or more combination coefficients corresponding to each spatial domain beam base vector, to obtain Q spatial domain beam base vector groups; and for one or more spatial domain beam base vectors in each of the Q spatial domain beam base vector groups, the transmit end determines all combination coefficients corresponding to the one or more spatial domain beam base vectors as one combination coefficient group, to obtain the Q combination coefficient groups corresponding to the Q spatial domain beam base vector groups.
  • the l spatial domain beam base vectors are spatial domain beam base vectors corresponding to all of the K combination coefficients. Quantities of spatial domain beam base vectors included in all of the Q spatial domain beam base vector groups may be the same, or may be different.
  • the Q combination coefficient groups are in a one-to-one correspondence with the Q spatial domain beam base vector groups, thereby facilitating use of different phase quantization precision for corresponding combination coefficient groups based on different degrees of impact of the spatial domain beam base vectors on system performance, for example, use of different phase quantization bit quantities and/or phase quantization rules, and helping reduce reporting overheads while minimizing a system performance loss.
  • a phase quantization bit quantity and a phase quantization rule that are used by the combination coefficient group correspond to a quantization method with higher quantization precision
  • a phase quantization bit quantity and a phase quantization rule that are used by the combination coefficient group correspond to a quantization method with lower quantization precision
  • a plurality of spatial domain beam base vectors with same amplitude value sums, same maximum amplitude values, or same sums of power may be grouped based on indexes of the plurality of spatial domain beam base vectors. For example, in a grouping process, if amplitude value sums, maximum amplitude values, or sums of power that correspond to a plurality of spatial domain beam base vectors are the same, based on the quantity of spatial domain beam base vectors included in each spatial domain beam base vector group, when a part of the plurality of spatial domain beam base vectors needs to be grouped into a spatial domain beam base vector group with a larger amplitude value sum, a larger maximum amplitude value, or a larger sum of power, and the other part needs to be grouped into a spatial domain beam base vector group with a smaller amplitude value sum, a smaller maximum amplitude value, or a smaller sum of power, a part of spatial domain beam base vectors with a larger or smaller index may be grouped into the spatial domain
  • sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each spatial domain beam base vector in a q 1 th spatial domain beam base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any spatial domain beam base vector in a q 2 th spatial domain beam base vector group corresponding to a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • a larger amplitude value sum, a larger maximum amplitude value, or a larger sum of power that corresponds to each spatial domain beam base vector in a spatial domain beam base vector group indicates greater impact of the spatial domain beam base vector group on system performance. Therefore, use of a larger phase quantization bit quantity by the spatial domain beam base vector group can reduce a system performance loss.
  • a smaller amplitude value sum, a smaller maximum amplitude value, or a smaller sum of power that corresponds to each spatial domain beam base vector in a spatial domain beam base vector group indicates less impact of the spatial domain beam base vector group on system performance. Therefore, use of a smaller phase quantization bit quantity by the spatial domain beam base vector group can reduce reporting overheads. Therefore, in this implementation, a compromise between minimization of the system performance loss and reduction of the reporting overheads can be achieved.
  • the transmit end may determine, in the K combination coefficients, one or more combination coefficients corresponding to each of m frequency-domain base vectors, where m is a positive integer less than or equal to M; the transmit end groups the m frequency-domain base vectors based on sum of amplitude value(s), a maximum amplitude value, or a sum of power of the one or more combination coefficients corresponding to each frequency-domain base vector, to obtain Q frequency-domain base vector groups; and for one or more frequency-domain base vectors in each of the Q frequency-domain base vector groups, the transmit end determines all combination coefficients corresponding to the one or more frequency-domain base vectors as one combination coefficient group, to obtain the Q combination coefficient groups corresponding to the Q frequency-domain base vector groups.
  • the m frequency-domain base vectors are frequency-domain base vectors corresponding to all of the K combination coefficients. Quantities of frequency-domain base vectors included in all of the Q frequency-domain base vector groups may be the same or different.
  • the Q frequency-domain base vector groups are in a one-to-one correspondence with the Q combination coefficient groups, thereby facilitating use of different phase quantization precision for corresponding combination coefficient groups based on different degrees of impact of the frequency-domain base vector groups on system performance, and helping achieve a compromise between system performance and reporting overheads.
  • a phase quantization bit quantity and a phase quantization rule that are used by the combination coefficient group correspond to a quantization method with higher quantization precision
  • a phase quantization bit quantity and a phase quantization rule that are used by the combination coefficient group correspond to a quantization method with lower quantization precision
  • the sum of power of the combination coefficient corresponding to each spatial domain beam base vector or each frequency-domain base vector is a sum of squares of amplitude values of all combination coefficients corresponding to each spatial domain beam base vector or each frequency-domain base vector.
  • a plurality of frequency-domain base vectors with same amplitude value sums, same maximum amplitude values, or same sums of power may be grouped based on indexes of the plurality of frequency-domain base vectors. For example, in a grouping process, if amplitude value sums, maximum amplitude values, or sums of power that correspond to a plurality of frequency-domain base vectors are the same, based on the quantity of frequency-domain base vectors included in each frequency-domain base vector group, when a part of the plurality of frequency-domain base vectors needs to be grouped into a frequency-domain base vector group with a larger amplitude value sum, a larger maximum amplitude value, or a larger sum of power, and the other part needs to be grouped into a frequency-domain base vector group with a smaller amplitude value sum, a smaller maximum amplitude value, or a smaller sum of power, a part of frequency-domain base vectors with a larger or smaller index may be grouped into the frequency-
  • sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each frequency-domain base vector in a q 1 th frequency-domain base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any frequency-domain base vector in a q 2 th frequency-domain base vector group corresponding to a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • a larger amplitude value sum, a larger maximum amplitude value, or a larger sum of power that corresponds to each frequency-domain base vector in a frequency-domain base vector group indicates greater impact of the frequency-domain base vector group on system performance. Therefore, use of a larger phase quantization bit quantity by the frequency-domain base vector group can reduce a system performance loss.
  • a smaller amplitude value sum, a smaller maximum amplitude value, or a smaller sum of power that corresponds to each frequency-domain base vector in a frequency-domain base vector group indicates less impact of the frequency-domain base vector group on system performance. Therefore, use of a smaller phase quantization bit quantity by the frequency-domain base vector group can reduce reporting overheads. Therefore, in this implementation, a compromise between minimization of the system performance loss and reduction of the reporting overheads can be achieved.
  • the transmit end determines, in the K combination coefficients, one or more combination coefficients corresponding to each of l spatial domain beam base vectors, where l is a positive integer less than or equal to L; for the one or more combination coefficients corresponding to each spatial domain beam base vector, the transmit end groups the one or more combination coefficients based on a descending order or ascending order of an amplitude value of each combination coefficient, to obtain the Q combination coefficient groups corresponding to each spatial domain beam base vector; and the transmit end combines a q th combination coefficient group corresponding to each of the l spatial domain beam base vectors, to obtain a q th combination coefficient group in the Q combination coefficient groups of the K combination coefficients, where q is an integer equal to 1, 2, ..., or Q.
  • That the q th combination coefficient group corresponding to each spatial domain beam base vector is combined means that a union set of a combination coefficient included in the q th combination coefficient group corresponding to each spatial domain beam base vector is obtained, and is used as the q th combination coefficient group in the Q combination coefficient groups of the K combination coefficients.
  • the q th combination coefficient group in the Q combination coefficient groups of the K combination coefficients includes the q th combination coefficient group corresponding to each spatial domain beam base vector.
  • this implementation facilitates use of different phase quantization precision based on different degrees of impact of different combination coefficient groups on performance, and further helps reduce reporting overheads while minimizing a performance loss.
  • a minimum amplitude value, sum of amplitude value(s), and a maximum amplitude value of a combination coefficient group corresponding to each spatial domain beam base vector in the combination coefficient groups are all larger, and a phase quantization bit quantity and a phase quantization rule that are used by the combination coefficient group correspond to a quantization method with higher quantization precision; and a minimum amplitude value, sum of amplitude value(s), and a maximum amplitude value of another combination coefficient group corresponding to each spatial domain beam base vector in the combination coefficient groups are all smaller, and a phase quantization bit quantity and a phase quantization rule that are used by the combination coefficient group correspond to a quantization method with lower quantization precision, thereby reducing reporting overheads while minimizing a performance loss.
  • Quantities of combination coefficients included in all of the Q combination coefficient groups corresponding to each spatial domain beam base vector may be the same, or may be different.
  • a plurality of combination coefficients with same amplitude values may be grouped based on indexes of frequency-domain base vectors corresponding to the plurality of combination coefficients.
  • a part of combination coefficients with a larger or smaller index of a corresponding frequency-domain beam base vector in the plurality of combination coefficients may be grouped into the combination coefficient group with the larger amplitude value, and the other part may be grouped into the combination coefficient group with the smaller amplitude value.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • a combination coefficient group corresponding to each spatial domain beam base vector included in the combination coefficient groups is a combination coefficient group with a larger maximum amplitude value, a larger minimum amplitude value, or a larger amplitude value sum, it indicates that the combination coefficient group has greater impact on system performance, and use of a larger phase quantization bit quantity for the combination coefficient group can minimize a system performance loss.
  • a combination coefficient group corresponding to each spatial domain beam base vector included in the combination coefficient groups is a combination coefficient group with a smaller maximum amplitude value, a smaller minimum amplitude value, or a smaller amplitude value sum, it indicates that the combination coefficient group has less impact on system performance, and use of a smaller phase quantization bit quantity for the combination coefficient group can reduce reporting overheads, thereby achieving a compromise between minimization of the system performance loss and reduction of the reporting overheads.
  • the amplitude value of each of the K combination coefficients is determined by performing quantization based on a preset quantization rule by using a quantization bit quantity A 1 , and A 1 is an integer greater than or equal to 2.
  • the amplitude value of each of the K combination coefficients is determined with reference to an average amplitude value or a maximum amplitude value of each spatial domain beam base vector corresponding to each combination coefficient and by performing differential quantization by using a quantization bit quantity A 3 ;
  • a 3 is an integer greater than or equal to 1;
  • the average amplitude value or the maximum amplitude value of each spatial domain beam base vector is an average amplitude value or a maximum amplitude value of one or more combination coefficients corresponding to each spatial domain beam base vector in the K combination coefficients; and the average amplitude value or the maximum amplitude value corresponding to each spatial domain beam base vector is determined by performing quantization by using an amplitude quantization bit quantity A 2 , and A 2 is an integer greater than or equal to 2.
  • the precoding matrix indication information further includes an average amplitude value or a maximum amplitude value corresponding to each of the l spatial domain beam base vector; l is a positive integer less than or equal to L; and the l spatial domain beam base vectors are spatial domain beam base vectors corresponding to all of the K combination coefficients.
  • the phase value of each combination coefficient in each combination coefficient group may be determined with reference to a phase value of a combination coefficient with a largest amplitude value in the combination coefficient group and by performing differential quantization by using a phase quantization bit quantity corresponding to the combination coefficient group.
  • the precoding matrix indication information further includes the phase value of the combination coefficient with the largest amplitude value in each combination coefficient group, the phase value of the combination coefficient with the largest amplitude value in each combination coefficient group is determined by performing quantization by using a phase quantization bit quantity B 1 , and B 1 is an integer greater than or equal to 2.
  • a manner of predefining or notifying by a base station may be used. In this way, the transmit end and the receive end can learn of an arrangement manner of content such as the amplitude values and the phase values of the combination coefficients in the precoding indication information.
  • the amplitude values of all of the K combination coefficients are located before the phase values of all the combination coefficients, that is, the amplitude values of all of the K combination coefficients are located in high-order bits, and the phase values of all of the K combination coefficients are located in low-order bits; in the precoding matrix indication information, the amplitude values of all of the K combination coefficients are sequentially arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors corresponding to the combination coefficients or indexes of the frequency-domain base vectors corresponding to the combination coefficients; and in the precoding matrix indication information, the phase values of all of the K combination coefficients are sequentially arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors corresponding to the combination coefficients or indexes of the frequency-domain base vectors corresponding to the combination coefficients; or in the precoding matrix indication information, for the Q combination coefficient groups to which the K combination coefficients are located before the phase values of all the
  • the average amplitude values or the maximum amplitude values corresponding to all of the l spatial domain beam base vectors are located before the amplitude values of all of the K combination coefficients, that is, the average amplitude values or the maximum amplitude values corresponding to all of the l spatial domain beam base vectors are located in high-order bits, and the amplitude values of all of the K combination coefficients are located in low-order bits; and in the precoding matrix indication information, the average amplitude values or the maximum amplitude values corresponding to the spatial domain beam base vectors are arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors.
  • this application further provides a precoding matrix indication method.
  • a receive end receives precoding matrix indication information, where the precoding matrix indication information includes an amplitude value and a phase value of each of K combination coefficients; and the receive end determines the amplitude value and the phase value of each of the K combination coefficients based on the precoding matrix indication information, where the amplitude value of each combination coefficient is determined by using a same amplitude quantization bit quantity and a same amplitude quantization rule; K is a positive integer less than or equal to L*M; L is a total quantity of spatial domain beam base vectors that is determined by the transmit end; and M is a total quantity of frequency-domain base vectors that is determined by the transmit end; and Q combination coefficient groups to which the K combination coefficients respectively belong are obtained through grouping based on the amplitude values of the K combination coefficients; the phase value of each combination coefficient is determined based on a phase quantization bit quantity and a phase quantization rule that are used by a combination coefficient
  • the Q combination coefficient groups to which the K combination coefficients respectively belong are obtained by grouping the K combination coefficients based on a descending order or ascending order of the amplitude values of all of the K combination coefficients.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the combination coefficients in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the combination coefficients in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • each of the Q combination coefficient groups to which the K combination coefficients respectively belong includes all combination coefficients corresponding to spatial domain beam base vectors in each of Q spatial domain beam base vector groups; the Q spatial domain beam base vector groups are obtained by grouping l spatial domain beam base vectors based on a descending order or ascending order of sum of amplitude value(s), a maximum amplitude value, or a sum of power of one or more combination coefficients corresponding to each of the l spatial domain beam base vectors in the K combination coefficients; and l is a positive integer less than or equal to L.
  • sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each spatial domain beam base vector in a q 1 th spatial domain beam base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any spatial domain beam base vector in a q 2 th spatial domain beam base vector group corresponding to a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • each of the Q combination coefficient groups to which the K combination coefficients respectively belong includes all combination coefficients corresponding to frequency-domain base vectors in each of the Q frequency-domain base vector groups; the Q frequency-domain base vector groups are obtained by grouping the M frequency-domain base vectors based on a descending order or ascending order of sum of amplitude value(s), a maximum amplitude value, or a sum of power of one or more combination coefficients corresponding to each of m frequency-domain base vectors in the K combination coefficients; and m is a positive integer less than or equal to M.
  • sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each frequency-domain base vector in a q 1 th frequency-domain base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any frequency-domain base vector in a q 2 th frequency-domain base vector group corresponding to a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • a q th combination coefficient group in the Q combination coefficient groups to which the K combination coefficients respectively belong is obtained by combining combination coefficient (s) in a q th combination coefficient group in Q combination coefficient groups corresponding to each of l spatial domain beam base vectors; l is a positive integer less than or equal to L; and q is an integer equal to 1, 2, ..., or Q; and the Q combination coefficient groups corresponding to each of the l spatial domain beam base vectors are obtained by grouping, for one or more combination coefficients corresponding to each spatial domain beam base vector, the one or more combination coefficients based on a descending order or ascending order of an amplitude value of each combination coefficient.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • the amplitude value of each of the K combination coefficients is determined by performing quantization by using a quantization bit quantity A 1 , and A 1 is an integer greater than or equal to 2.
  • phase value of each combination coefficient in each combination coefficient group is determined by performing quantization by using a phase quantization bit quantity corresponding to the combination coefficient group.
  • the amplitude value of each of the K combination coefficients is determined with reference to an average amplitude value or a maximum amplitude value of each spatial domain beam base vector corresponding to each combination coefficient and by performing differential quantization by using a quantization bit quantity A 3 ;
  • a 3 is an integer greater than or equal to 1;
  • the average amplitude value or the maximum amplitude value of each spatial domain beam base vector is an average amplitude value or a maximum amplitude value of one or more combination coefficients corresponding to each spatial domain beam base vector in the K combination coefficients; and the average amplitude value or the maximum amplitude value corresponding to each spatial domain beam base vector is determined by performing quantization by using an amplitude quantization bit quantity A 2 , and A 2 is an integer greater than or equal to 2.
  • the phase value of each combination coefficient in each combination coefficient group may be determined with reference to a phase value of a combination coefficient with a largest amplitude value in the combination coefficient group and by performing differential quantization by using a phase quantization bit quantity corresponding to the combination coefficient group.
  • the precoding matrix indication information further includes the phase value of the combination coefficient with the largest amplitude value in each combination coefficient group, the phase value of the combination coefficient with the largest amplitude value in each combination coefficient group is determined by performing quantization by using a phase quantization bit quantity B, and B is an integer greater than or equal to 2.
  • the amplitude values of all of the K combination coefficients are located before the phase values of all the combination coefficients; in the precoding matrix indication information, the amplitude values of all of the K combination coefficients are sequentially arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors corresponding to the combination coefficients or indexes of the frequency-domain base vectors corresponding to the combination coefficients; and in the precoding matrix indication information, the phase values of all of the K combination coefficients are sequentially arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors corresponding to the combination coefficients or indexes of the frequency-domain base vectors corresponding to the combination coefficients; or in the precoding matrix indication information, for the Q combination coefficient groups to which the K combination coefficients respectively belong, phase values of the combination coefficient groups are sequentially arranged based on a descending order or ascending order of indexes of the combination coefficient groups; and in a
  • the precoding matrix indication information further includes an average amplitude value or a maximum amplitude value corresponding to each of the l spatial domain beam base vector; l is a positive integer less than or equal to L; and the l spatial domain beam base vectors are spatial domain beam base vectors corresponding to all of the K combination coefficients; the amplitude value of each of the K combination coefficients is determined with reference to an average amplitude value or a maximum amplitude value of each spatial domain beam base vector corresponding to each combination coefficient and by performing differential quantization by using a quantization bit quantity A 3 ; A 3 is an integer greater than or equal to 1; and the average amplitude value or the maximum amplitude value of each spatial domain beam base vector is an average amplitude value or a maximum amplitude value of one or more combination coefficients corresponding to each spatial domain beam base vector in the K combination coefficients; and the average amplitude value or the maximum amplitude value corresponding to each spatial domain beam base vector is determined by performing quantization by using an amplitude quantization bit
  • a structure of the device may include a processing unit and a communications unit.
  • the processing unit is configured to support the transmit end in performing a corresponding function in the foregoing method.
  • the communications unit is configured to support communication between the device and another device.
  • the transmit end may further include a storage unit.
  • the storage unit is configured to be coupled to the processing unit, and stores program instructions and data that are necessary for a terminal device.
  • the processing unit may be a processor
  • the communications unit may be a transceiver
  • the storage unit may be a memory.
  • an embodiment of this application further provides a device.
  • the device has some or all of functions of the receive end for implementing the example of the precoding matrix indication method according to the second aspect.
  • the function of the device may have functions in some or all of embodiments of this application, or may have a function of separately implementing any one of embodiments of this application.
  • the function may be implemented by hardware, or may be implemented by hardware by executing corresponding software.
  • the hardware or the software includes one or more units or modules corresponding to the foregoing function.
  • an embodiment of the present invention provides a communications system.
  • the system includes the transmit end and the receive end according to the foregoing aspects.
  • the system may further include another device that interacts with the transmit end and/or the receive end in the solutions provided in the embodiments of the present invention.
  • an embodiment of the present invention provides a computer storage medium, configured to store computer software instructions used by the transmit end, and including a program designed to perform the precoding matrix indication method according to the first aspect.
  • an embodiment of the present invention provides a computer storage medium, configured to store computer software instructions used by the receive end, and including a program designed to perform the precoding matrix indication method according to the second aspect.
  • this application further provides a computer program product including instructions.
  • the computer program product runs on a computer, the computer is enabled to perform the method according to the first aspect or the second aspect.
  • this application provides a chip system.
  • the chip system includes a processor, configured to support a receive end in implementing the function in the foregoing aspect, for example, generating or processing data and/or information in the foregoing method.
  • the chip system further includes a memory.
  • the memory is configured to store program instructions and data that are necessary for the receive end.
  • the chip system may include a chip, or may include a chip and another discrete component.
  • the technical solutions in this application may be specifically applied to various communications systems, for example, a global system for mobile communications (Global system for mobile communications, GSM for short) system, a code division multiple access (Code Division Multiple Access, CDMA for short) system, a wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA for short) system, a time division-synchronous code division multiple access (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA for short) system, a universal mobile telecommunications system (Universal Mobile Telecommunications System, UMTS for short), and a long term evolution (Long Term Evolution, LTE for short) system.
  • GSM Global system for mobile communications
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • TD-SCDMA time division-synchronous code division multiple access
  • Universal Mobile Telecommunications System Universal Mobile Telecommunications System
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • a 5G system which may also be referred to as a new radio (New Radio, NR for short) system
  • NR New Radio
  • the technical solutions may be applied to a device to device (device to device, D2D for short) system, a machine to machine (machine to machine, M2M for short) system, or the like.
  • a receive end in this application may be an entity configured to send or receive information on a network side, for example, may be a base station, a transmission point (transmission point, TP for short), a transmission reception point (transmission and reception point, TRP for short), a relay device, or another network device that has a base station function. This is not limited in this application.
  • a transmit end in this application may be a device having a communication function, and may include a handheld device having a wireless communication function, a vehicle-mounted device, a wearable device, a computing device, another processing device connected to a wireless modem, or the like.
  • a terminal device may have different names in different networks, for example, a terminal (terminal) device, user equipment (user equipment, UE for short), a mobile station, a subscriber unit, a relay (Relay), a station, a cellular phone, a personal digital assistant, a wireless modem, a wireless communications device, a handheld device, a laptop computer, a cordless phone, and a wireless local loop station.
  • the terminal device may be a wireless terminal device or a wired terminal device.
  • the wireless terminal device may be a device that provides a user with voice and/or data connectivity, a handheld device having a wireless connection function, or another processing device connected to a wireless modem, and may communicate with one or more core networks by using a radio access network (RAN, radio access network).
  • RAN radio access network
  • Massive MIMO massive multiple input multiple output
  • spectral efficiency can be significantly improved by using a large-scale antenna, and accuracy of channel state information obtained by a base station determines performance of massive MIMO to a great extent. Therefore, a codebook is usually used to quantize the channel state information.
  • the codebook is used to quantize the channel state information, an original channel feature needs to be approximated as much as possible with allowable overheads, so that channel quantization is more accurate.
  • a significant performance advantage may be obtained by performing linear combination on a plurality of orthogonal beams by using a high-precision codebook.
  • p i represents an amplitude value of a combination coefficient corresponding to the i th spatial domain beam base vector on a measured precoding matrix index (Precoding Matrix Index, PMI) frequency-domain unit
  • ⁇ i represents a phase value of the combination coefficient corresponding to the i th spatial domain beam base vector on the measured PMI frequency-domain unit.
  • the foregoing formula (4) is used to quantize the channel state information, and the foregoing precoding matrix is reported to a base station. This helps the base station obtain an approximately optimal precoding matrix.
  • the foregoing precoding matrix improves performance, but also causes huge precoding matrix indication overheads, for example, in the precoding matrix, amplitude values and phase values of L combination coefficients corresponding to each PMI frequency-domain unit need to be reported. Especially, a larger quantity of PMI frequency-domain units indicates a larger quantity of combination coefficients that need to be reported.
  • W W 1 W ⁇ W 3 .
  • W is a joint precoding matrix including the precoding matrix corresponding to the N PMI frequency-domain units, and has dimensions of 2N1N2*N.
  • p i,j represents an amplitude value of a combination coefficient corresponding to linear combination performed on the i th spatial domain beam base vector and a j th frequency-domain base vector
  • ⁇ i,j represents a phase value of the combination coefficient corresponding to linear combination performed on the i th spatial domain beam base vector and the j th frequency-domain base vector.
  • the terminal device only needs to feed back indexes of the L/2 selected spatial domain beam base vectors, indexes of the M frequency-domain base vectors, and amplitude values and phase values of L*M combination coefficients in W ⁇ based on the measured channel state information, and the base station may obtain, based on the information that is fed back, a precoding matrix quantized based on the channel state information.
  • reporting overheads required for the L*M combination coefficients are L*M*X. It can be learned that, to minimize a performance loss caused by quantization, a larger quantization bit quantity is preferred. However, reporting overheads increase linearly.
  • this application provides a precoding matrix indication method.
  • the precoding matrix indication method is proposed for how to reduce the reporting overheads required for the L*M combination coefficients. In other words, how to report the L*M combination coefficients with as low overheads as possible while ensuring minimization of the performance loss is a problem that needs to be resolved in this application.
  • the amplitude values and the phase values of the L*M combination coefficients if a strongest combination coefficient in the L*M combination coefficients is used to perform normalization processing on W ⁇ , only an index of the strongest combination coefficient and amplitude values and phase values of remaining L*M-1 combination coefficients need to be reported.
  • the strongest combination coefficient is a combination coefficient with a largest amplitude value in the L*M combination coefficients.
  • the combination coefficient matrix W ⁇ is determined when a quantity of paths of data that can be transmitted in parallel in the MIMO system is 1, that is, the quantity of spatial layers is 1, and the quantity of spatial layers is determined by calculating a rank of a measured equivalent channel matrix.
  • a process of determining a combination coefficient matrix is similar to that in the foregoing content, and a difference lies in that each spatial layer corresponds to one precoding matrix, and therefore, one combination coefficient matrix W ⁇ needs to be determined for each spatial layer.
  • a same precoding matrix indication method may be used for each spatial layer, to report a combination coefficient corresponding to each spatial layer.
  • a same spatial domain beam base vector and a same frequency-domain base vector may be used for linear combination, or different spatial domain beam base vectors and different frequency-domain base vectors may be used for linear combination.
  • a transmit end is a device that sends precoding indication information.
  • the transmit end may be a terminal device, and a receive end may be a base station.
  • the communications system may include one or more base stations and one or more terminal devices.
  • FIG. 2 is a schematic flowchart of a precoding matrix indication method according to an embodiment of this application. As shown in FIG. 2 , a manner of feeding back an amplitude value and a phase value of a combination coefficient in the precoding matrix indication method may include the following steps.
  • the transmit end groups the K combination coefficients based on the amplitude value of each of the K combination coefficients corresponding to each spatial layer, to obtain Q combination coefficient groups, where Q is an integer greater than or equal to 2.
  • a receive end may determine a grouping status of the K combination coefficients based on the amplitude value of each combination coefficient, that is, determine the Q combination coefficient groups.
  • a value of Q may be notified by the base station to the terminal device, or may be determined by the terminal device or the base station based on measured channel state information and notified to the base station or the terminal device, or a value of Q is predefined in a protocol.
  • the transmit end determines a phase value of each combination coefficient in each combination coefficient group, where phase quantization bit quantities and/or phase quantization rules used by at least two of the Q combination coefficient groups are different.
  • phase quantization bit quantities and/or phase quantization rules used by any two combination coefficient groups are different. At least one of a phase quantization bit quantity and a phase quantization rule that are used by at least one combination coefficient group is different from at least one of a phase quantization bit quantity and a phase quantization rule that are used by another combination coefficient group.
  • Q is equal to 3
  • phase quantization bit quantities and phase quantization rules that are used by combination coefficient groups 1, 2, and 3 are different; or phase quantization bit quantities used by combination coefficient groups 1, 2, and 3 are the same, but phase quantization rules used by the combination coefficient groups 1, 2, and 3 are different; or phase quantization bit quantities used by combination coefficient groups 1, 2, and 3 are different, but phase quantization rules used by the combination coefficient groups 1, 2, and 3 are the same.
  • the amplitude quantization rule is how to quantize the amplitude value by using the amplitude quantization bit quantity to obtain a quantized amplitude set, that is, a set including optional quantized amplitude values, so that a closest quantized amplitude value can be selected for an amplitude value that is not quantized, and an index corresponding to the selected quantized amplitude value in the quantized amplitude set is carried in the sent precoding matrix indication information and is used as a to-be-reported amplitude value.
  • a larger used amplitude quantization bit quantity and a larger used phase quantization bit quantity indicate higher corresponding quantization precision with reference to a quantization rule and indicate that a quantized amplitude value and a quantized phase value are closer to actual values measured in a system, thereby helping minimize a performance loss.
  • this causes higher reporting overheads.
  • the K combination coefficients are grouped into the Q combination coefficient groups based on the amplitude value of each combination coefficient, so that the phase quantization bit quantities and/or the phase quantization rules used by the at least two of the Q combination coefficient groups are different.
  • this facilitates use of a phase quantization bit quantity and a phase quantization rule for high-precision quantization, or use of a phase quantization bit quantity or a phase quantization rule for high-precision quantization.
  • this embodiment of this application helps achieve an optimal compromise between performance and overheads.
  • this embodiment of this application helps ensure that a high-precision quantization method is used for amplitude values of all combination coefficients, and a low-precision quantization method is used only for a phase value of a combination coefficient group having less impact on system performance, to avoid, to the greatest extent, a performance loss caused by a decrease in quantization precision.
  • the transmit end may group the K combination coefficients based on the descending order or ascending order of the amplitude values of all of the K combination coefficients, to obtain the Q combination coefficient groups.
  • the receive end may also obtain the grouping status of the K combination coefficients based on the descending order or ascending order of the amplitude values. In this way, this facilitates use of a smaller phase quantization bit quantity for a combination coefficient group with a smaller amplitude value, and use of a larger phase quantization bit quantity for a combination coefficient group with a larger amplitude value, thereby reducing reporting overheads while minimizing a system performance loss.
  • Quantities of combination coefficients included in the combination coefficient groups may be the same, or may be different.
  • each of the first combination coefficient group to a (Q-1) th combination coefficient group may include ⁇ K / Q ⁇ combination coefficients, and a Q th combination coefficient group includes K - ⁇ K / Q ⁇ ( Q -1) combination coefficients.
  • the first combination coefficient group includes ⁇ K / Q ⁇ combination coefficients with largest amplitude values in the K combination coefficients; the Q th combination coefficient group includes K - ⁇ K / Q ⁇ ( Q -1) combination coefficients with smallest amplitude values in the K combination coefficients; and if Q is an integer greater than or equal to 3, a q th combination coefficient group includes ⁇ K / Q ⁇ combination coefficients with largest amplitude values other than ⁇ K / Q ⁇ *(q-1) combination coefficients with largest amplitude values in the K combination coefficients, q is an integer greater than 1 and less than Q, and ⁇ ⁇ represents a floor operation.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the combination coefficients in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the combination coefficients in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • reporting overheads required for reporting the foregoing 23 combination coefficients are 23*3+11*3+12*2 bits, while in the conventional technology, 23*6 bits are required if an amplitude value and a phase value use same quantization precision, which significantly reduces the reporting overheads.
  • 23*6 bits are required if an amplitude value and a phase value use same quantization precision, which significantly reduces the reporting overheads.
  • K increases, more reporting overheads can be reduced in this implementation.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of the combination coefficients in the second combination coefficient group is smaller, and the second combination coefficient group has less impact on system performance; and a smaller phase quantization bit quantity, that is, 2, is used for a phase value of each combination coefficient in the combination coefficient group.
  • the K combination coefficients are grouped based on l spatial domain beam base vectors corresponding to the K combination coefficients, where l is a positive integer less than or equal to L.
  • the transmit end may determine, in the K combination coefficients, one or more combination coefficients corresponding to each of the l spatial domain beam base vectors; the transmit end groups the 2L spatial domain beam base vectors based on sum of amplitude value(s), a maximum amplitude value, or a sum of power of the one or more combination coefficients corresponding to each spatial domain beam base vector, to obtain Q spatial domain beam base vector groups; and for one or more spatial domain beam base vectors in each of the Q spatial domain beam base vector groups, the transmit end determines all combination coefficients corresponding to the one or more spatial domain beam base vectors as one combination coefficient group, to obtain the Q combination coefficient groups corresponding to the Q spatial domain beam base vector groups.
  • the K combination coefficients may be corresponding combination coefficients distributed in any row, and each row corresponds to one spatial domain beam base vector. Therefore, the l spatial domain beam base vectors include spatial domain beam base vectors corresponding to the row to which the K combination coefficients respectively belong, and correspondingly, one or more combination coefficients corresponding to each spatial domain beam base vector are combination coefficients that are in a row corresponding to the spatial domain beam base vector and that belong to the K combination coefficients.
  • Quantities of spatial domain beam base vectors included in all of the Q spatial domain beam base vector groups may be the same, or may be different.
  • Each of the first spatial domain beam base vector group to a (Q-1) th spatial domain beam base vector group may include ⁇ L / Q ⁇ spatial domain beam base vectors, and a Q th spatial domain beam base vector group includes L - ⁇ L / Q ⁇ ( Q -1) spatial domain beam base vectors.
  • the first spatial domain beam base vector group includes ⁇ L / Q ⁇ spatial domain beam base vectors with larger amplitude value sums, larger maximum amplitude values, or larger sums of power in the L spatial domain beam base vectors
  • the Q th spatial domain beam base vector group includes L - ⁇ L / Q ⁇ ( Q -1) spatial domain beam base vectors with smaller amplitude value sums, smaller maximum amplitude values, or smaller sums of power in the L spatial domain beam base vectors.
  • a q th spatial domain beam base vector group includes ⁇ L / Q ⁇ spatial domain beam base vectors with larger amplitude value sums, larger maximum amplitude values, or larger sums of power other than ⁇ L / Q ⁇ *(q-1) combination coefficients with larger amplitude value sums, larger maximum amplitude values, or larger sums of power in the L spatial domain beam base vectors, and q is an integer greater than 1 and less than Q.
  • all combination coefficients corresponding to each spatial domain beam base vector group are used as one combination coefficient group, and a phase quantization bit quantity used by each combination coefficient group satisfies the following feature: An amplitude value sum, a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each spatial domain beam base vector in a q 1 th spatial domain beam base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any spatial domain beam base vector in a q 2 th spatial domain beam base vector group corresponding to a q 2 th combination coefficient group; a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group; q 1 is not equal to q
  • phase quantization bit quantity is used for these combination coefficient groups, so that a system performance loss can be reduced while reporting overheads are reduced.
  • the first spatial domain beam base vector group includes three spatial domain beam base vectors with larger maximum amplitude values
  • the second spatial domain beam base vector group includes three spatial domain beam base vectors with smaller amplitude values, as shown in Table 3.
  • combination coefficients corresponding to all the spatial domain beam base vectors in the first spatial domain beam base vector group form the first combination coefficient group
  • combination coefficients corresponding to all the spatial domain beam base vectors in the second spatial domain beam base vector group form the second combination coefficient group, as shown in Table 3.
  • the sixth spatial domain beam base vector in the fifth spatial domain beam base vector and the sixth spatial domain beam base vector that have the same maximum amplitude value may be grouped into a high-precision quantization group, that is, the first spatial domain beam base vector group.
  • a phase value of each combination coefficient in the first combination coefficient group may use a phase quantization bit quantity that is 3, and a phase value of each combination coefficient in the second combination coefficient group may use a phase quantization bit quantity that is 2, thereby minimizing a system performance loss while reducing reporting overheads.
  • the amplitude values of the combination coefficients use same amplitude quantization precision. Therefore, a grouping status of the foregoing combination coefficient groups or a grouping status of the spatial domain beam base vectors does not need to be additionally reported; and the receive end can determine the grouping status in the foregoing manner based on the amplitude value of each combination coefficient, thereby avoiding an increase in reporting overheads caused by a grouping indication.
  • the K combination coefficients are grouped based on m frequency-domain base vectors corresponding to the K combination coefficients, where m is a positive integer less than or equal to M.
  • the transmit end may determine, in the K combination coefficients, one or more combination coefficients corresponding to each of the m frequency-domain base vectors; the transmit end groups the m frequency-domain base vectors based on one of sum of amplitude value(s), a maximum amplitude value, or a sum of power of the one or more combination coefficients corresponding to each frequency-domain base vector, to obtain Q frequency-domain base vector groups; and for one or more frequency-domain base vectors in each of the Q frequency-domain base vector groups, the transmit end determines all combination coefficients corresponding to the one or more frequency-domain base vectors as one combination coefficient group, to obtain the Q combination coefficient groups corresponding to the Q frequency-domain base vector groups.
  • the K combination coefficients may be combination coefficients distributed in any column, and each column corresponds to one frequency-domain base vector. Therefore, the m frequency-domain base vectors include frequency-domain base vectors corresponding to the column to which the K combination coefficients respectively belong, and correspondingly, one or more combination coefficients corresponding to each frequency-domain base vector are combination coefficients that are in a row corresponding to the frequency-domain base vector and that belong to the K combination coefficients.
  • a maximum amplitude value of the combination coefficient corresponding to the j th frequency-domain base vector is max ⁇
  • , i 1,2,..., L ⁇
  • the M frequency-domain base vectors are grouped based on one of sum of amplitude value(s), a maximum amplitude value, or a sum of power corresponding to each spatial domain beam base vector, to obtain the Q frequency-domain base vector groups
  • Each of the first frequency-domain base vector group to a (Q-1) th frequency-domain base vector group may include ⁇ M / Q ⁇ frequency-domain base vectors, and a Q th frequency-domain base vector group includes M - ⁇ M / Q ⁇ ( Q -1) frequency-domain base vectors.
  • the first frequency-domain base vector group includes ⁇ M / Q ⁇ frequency-domain base vectors with larger amplitude value sums, larger maximum amplitude values, or larger sums of power in the M frequency-domain base vectors
  • the Q th frequency-domain base vector group includes M - ⁇ M / Q ⁇ ( Q -1) frequency-domain base vectors with smaller amplitude value sums, smaller maximum amplitude values, or smaller sums of power in the M frequency-domain base vectors.
  • a q th frequency-domain base vector group includes ⁇ M / Q ⁇ frequency-domain base vectors with larger amplitude value sums, larger maximum amplitude values, or larger sums of power other than ⁇ M / Q ⁇ *(q-1) combination coefficients with larger amplitude value sums, larger maximum amplitude values, or larger sums of power in the M frequency-domain base vectors, and q is an integer greater than 1 and less than Q.
  • the first frequency-domain base vector group includes M 1 frequency-domain base vectors with larger amplitude value sums, larger maximum amplitude values, or larger sums of power in the M frequency-domain base vectors
  • the Q th frequency-domain base vector group includes M Q frequency-domain base vectors with smaller amplitude value sums, smaller maximum amplitude values, or smaller sums of power in the M frequency-domain base vectors.
  • sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each frequency-domain base vector in a q 1 th frequency-domain base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any frequency-domain base vector in a q 2 th frequency-domain base vector group corresponding to a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • phase quantization bit quantity is used for these combination coefficient groups, so that a system performance loss can be reduced while reporting overheads are reduced.
  • the first frequency-domain base vector group includes two frequency-domain base vectors with larger amplitude value sums
  • the second frequency-domain base vector group includes two frequency-domain base vectors with smaller amplitude value sums, as shown in Table 3.
  • combination coefficients corresponding to all the frequency-domain base vectors in the first frequency-domain base vector group form the first combination coefficient group
  • combination coefficients corresponding to all the frequency-domain base vectors in the second frequency-domain base vector group form the second combination coefficient group, as shown in Table 5.
  • the amplitude values of the combination coefficients use same amplitude quantization precision. Therefore, a grouping status of the foregoing combination coefficient groups or a grouping status of the frequency-domain base vectors does not need to be additionally reported; and the receive end can determine the grouping status in the foregoing manner based on the amplitude value of each combination coefficient, thereby avoiding an increase in reporting overheads caused by grouping.
  • a combination coefficient corresponding to each spatial domain beam base vector is grouped based on l spatial domain beam base vectors corresponding to the K combination coefficients, to obtain the Q combination coefficient groups corresponding to the K combination coefficients, where l is a positive integer less than or equal to 2L.
  • the transmit end may determine, in the K combination coefficients, one or more combination coefficients corresponding to each of the l spatial domain beam base vectors; for the one or more combination coefficients corresponding to each spatial domain beam base vector, the transmit end groups the one or more combination coefficients based on a descending order or ascending order of an amplitude value of each combination coefficient, to obtain the Q combination coefficient groups corresponding to each spatial domain beam base vector; and the transmit end combines a q th combination coefficient group corresponding to each of the l spatial domain beam base vectors, to obtain a q th combination coefficient group in the Q combination coefficient groups of the K combination coefficients, where q is an integer equal to 1, 2, ..., or Q.
  • the K combination coefficients may be combination coefficients distributed in any row, and each row corresponds to one spatial domain beam base vector. Therefore, the l spatial domain beam base vectors include spatial domain beam base vectors corresponding to the row to which the K combination coefficients respectively belong, and correspondingly, one or more combination coefficients corresponding to each spatial domain beam base vector are combination coefficients that are in a row corresponding to the spatial domain beam base vector and that belong to the K combination coefficients.
  • quantities of combination coefficients included in all of the Q combination coefficient groups corresponding to each spatial domain beam base vector may be the same, or may be different.
  • an l 1 th spatial domain beam base vector corresponds to K l 1 combination coefficients
  • the first combination coefficient group to a (Q-1) th combination coefficient group corresponding to the l 1 th spatial domain beam base vector each may include ⁇ K l 1 / Q ⁇ combination coefficients
  • K l 1 q may be predefined by a system or notified by a base station.
  • the first combination coefficient group corresponding to the l 1th spatial domain beam base vector includes K l 1 1 combination coefficients with larger amplitude values in combination coefficients corresponding to the l 1 th spatial domain beam base vector.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • phase quantization bit quantity is used for these combination coefficient groups, so that a system performance loss can be reduced while reporting overheads are reduced.
  • the combination coefficients corresponding to each spatial domain beam base vector are grouped into two combination coefficient groups based on the amplitude values; and further, the first combination coefficient group corresponding to each spatial domain beam base vector is combined, to obtain the first combination coefficient group corresponding to the 24 combination coefficients, and the second combination coefficient group corresponding to each spatial domain beam base vector is combined, to obtain the second combination coefficient group corresponding to the 24 combination coefficients.
  • a phase value of each combination coefficient in the finally determined first combination coefficient group may use a phase quantization bit quantity that is 3, and a phase value of each combination coefficient in the finally determined second combination coefficient group may use a phase quantization bit quantity that is 2, thereby minimizing a system performance loss while reducing reporting overheads.
  • a same grouping rule is used when the combination coefficients corresponding to all the spatial domain beam base vectors are grouped.
  • the optional implementation may be predefined by the transmit end and the receive end, or notified by the base station to the terminal device, so that the transmit end and the receive end use a same grouping rule. This helps the receive end obtain the grouping status of all the combination coefficients based on the amplitude values of all the combination coefficients, thereby avoiding reporting overheads caused by an additional indication of the grouping status.
  • phase quantization bit quantities and/or phase quantization rules used by at least one of the foregoing combination coefficient groups and another combination coefficient group are different. For example, a minimum amplitude value, sum of amplitude value(s), a maximum amplitude value, or a sum of power corresponding to the determined first combination coefficient group is greater than a minimum amplitude value, sum of amplitude value(s), a maximum amplitude value, or a sum of power corresponding to the second combination coefficient group.
  • c 2 l 2 m 2 represents an index corresponding to a quantized phase value of a combination coefficient in the second combination coefficient group.
  • a quantized phase value closest to an actual phase value of the combination coefficient may be selected from the quantized phase set, as a phase value of the combination coefficient. Therefore, in the precoding matrix indication information, 2 bits may be used to represent an index of the phase value of the combination coefficient in the quantized phase set, as the phase value of the combination coefficient.
  • the amplitude value of each of the K combination coefficients is determined by performing quantization by using a quantization bit quantity A 1 , and A 1 is an integer greater than or equal to 2.
  • a 1 is an integer greater than or equal to 2.
  • the amplitude quantization bit quantity is 3, and a quantized amplitude set formed by optional quantized amplitude values is shown in Table 1.
  • a quantized amplitude value may be selected from Table 1, and the quantized amplitude value is closest to an actual value obtained after normalization processing is performed on the combination coefficient.
  • the precoding indication information may carry a quantization index indicated by 3 bits, to indicate a quantized amplitude value of the combination coefficient, and the quantized amplitude value may be used as the amplitude value of the combination coefficient, so that the receive end can obtain, based on the quantized amplitude set, the quantized amplitude value corresponding to the quantization index indicated by the 3 bits.
  • an amplitude quantization rule for differential amplitude quantization is used with reference to an average amplitude value of the combination coefficient corresponding to the spatial domain beam base vector.
  • the K combination coefficients correspond to l spatial domain beam base vectors
  • each of the l spatial domain beam base vectors corresponds to one or more combination coefficients.
  • the transmit end may calculate an average amplitude value of the combination coefficient corresponding to the spatial domain beam base vector, as an average amplitude value of each spatial domain beam base vector, and perform quantization by using an amplitude quantization bit quantity A 2 for the average amplitude value of each spatial domain beam base vector.
  • the transmit end may perform differential amplitude quantization by using an amplitude quantization bit quantity A 3 with reference to the average amplitude value for the amplitude value of each combination coefficient corresponding to each spatial domain beam base vector. Therefore, an amplitude value of one combination coefficient corresponding to each spatial domain beam base vector is a product of the average amplitude value and a differential amplitude value of the combination coefficient.
  • a 2 is an integer greater than or equal to 2
  • a 3 is an integer greater than or equal to 1.
  • the transmit end selects a differential quantized amplitude value from the differential quantized amplitude set shown in Table 7, where the differential quantized amplitude value is a quantized value closest to a differential amplitude value between the amplitude value of the combination coefficient and the average amplitude value.
  • the precoding indication information may carry average amplitude values (which may also be referred to as indexes of the average amplitude values in the quantized amplitude set shown in Table 1) corresponding to all of the l spatial domain beam base vectors, and amplitude values (which may also be referred to as differential quantized amplitude values, or quantization indexes of the differential quantized amplitude values in the differential quantized amplitude set shown in Table 7) of the combination coefficients corresponding to all the spatial domain beam base vectors.
  • average amplitude values which may also be referred to as indexes of the average amplitude values in the quantized amplitude set shown in Table 1
  • amplitude values which may also be referred to as differential quantized amplitude values, or quantization indexes of the differential quantized amplitude values in the differential quantized amplitude set shown in Table 7
  • an amplitude quantization rule for differential amplitude quantization is used with reference to a maximum amplitude value of the combination coefficient corresponding to the spatial domain beam base vector.
  • Table 8 shows a differential quantized amplitude set formed by optional differential quantized amplitude values with reference to a maximum amplitude value.
  • the transmit end may select a quantized amplitude value from Table 1, where the quantized amplitude value is a quantized value closest to the maximum amplitude value of the combination coefficient corresponding to the spatial domain beam base vector.
  • the transmit end selects a differential quantized amplitude value from the differential quantized amplitude set shown in Table 8, where the differential quantized amplitude value is a quantized value closest to a differential amplitude value between the amplitude value of the combination coefficient and the maximum amplitude value.
  • the precoding indication information may carry maximum amplitude values (which may also be referred to as indexes of the corresponding maximum amplitude values in the quantized amplitude set shown in Table 1) corresponding to all of the l spatial domain beam base vectors, and amplitude values (which may also be referred to as differential quantized amplitude values, or quantization indexes of the differential quantized amplitude values in the differential quantized amplitude set shown in Table 8) of the combination coefficients corresponding to all the spatial domain beam base vectors.
  • maximum amplitude values which may also be referred to as indexes of the corresponding maximum amplitude values in the quantized amplitude set shown in Table 1
  • amplitude values which may also be referred to as differential quantized amplitude values, or quantization indexes of the differential quantized amplitude values in the differential quantized amplitude set shown in Table 8
  • the receive end receives the precoding matrix indication information, and may also obtain, by using Table 1 and Table 8, the maximum amplitude value corresponding to each spatial domain beam base vector and the differential quantized amplitude value corresponding to each combination coefficient, to obtain the quantized amplitude value (namely, an amplitude value) of each combination coefficient.
  • Table 8 Quantization index Maximum quantized amplitude value 0 0 1 1 / 4 2 1 / 2 3 1
  • the transmit end and the receive end may know, through notification by the base station or through predefinition, that in the precoding matrix indication information, the amplitude values of all of the K combination coefficients are located before or after the phase values of all the combination coefficients. That is, the amplitude values of all of the K combination coefficients are located in high-order bits, and the phase values of all of the K combination coefficients are located in low-order bits; or the amplitude values of all of the K combination coefficients are located in low-order bits, and the phase values of all of the K combination coefficients are located in high-order bits.
  • the amplitude values of all of the K combination coefficients are sequentially arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors corresponding to the combination coefficients.
  • K L*M
  • phase values of all of the K combination coefficients are sequentially arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors corresponding to the combination coefficients or indexes of the frequency-domain base vectors corresponding to the combination coefficients; or in the precoding matrix indication information, for the Q combination coefficient groups to which the K combination coefficients respectively belong, phase values of the combination coefficient groups are sequentially arranged based on a descending order or ascending order of indexes of the combination coefficient groups. For example, phase values of all combination coefficients in the first combination coefficient group are arranged before or after phase values of all combination coefficients in the second combination coefficient group.
  • phase values of combination coefficients are sequentially arranged based on a descending order or ascending order of indexes of spatial domain beam base vectors corresponding to the combination coefficients or indexes of frequency-domain base vectors corresponding to the combination coefficients.
  • the precoding matrix indication information further includes an average amplitude value or a maximum amplitude value corresponding to each of l spatial domain beam base vectors; and the average amplitude values or the maximum amplitude values corresponding to the spatial domain beam base vectors are arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors.
  • arrangement in a process of arranging the amplitude values or the phase values, in a process of performing arrangement based on a sequence of the indexes of the frequency-domain base vectors corresponding to the combination coefficients, if indexes of frequency-domain base vectors corresponding to a plurality of combination coefficients are the same, arrangement may be further performed based on a descending order or ascending order of indexes of spatial domain beam base vectors corresponding to the plurality of combination coefficients.
  • the amplitude values or the phase values of the L*M combination coefficients may be arranged one by one based on each row shown in the formula (8), or may be arranged one by one based on each column shown in the formula (8).
  • arrangement in a process of arranging the phase values, arrangement may be performed first based on a sequence of the indexes of the combination coefficient groups. For combination coefficients having a same index in the combination coefficient groups, phase values may be arranged based on a descending order or ascending order of indexes of corresponding spatial domain beam base vectors. Further, if the indexes of the spatial domain beam base vectors corresponding to the combination coefficients are also the same, arrangement may be performed based on a descending order or ascending order of indexes of corresponding frequency-domain base vectors.
  • phase values of the combination coefficients in the first combination coefficient group corresponding to the 24 combination coefficients are first arranged; and then phase values of the combination coefficients in the second combination coefficient group corresponding to the 24 combination coefficients are arranged.
  • arrangement may be performed based on a descending order or ascending order of indexes of spatial domain beam base vectors corresponding to the combination coefficients. For example, p 1,1 ⁇ 1,1 and p 1,2 ⁇ 1,2 corresponding to the first spatial domain beam base vector are first arranged; ...; and p 6,3 ⁇ 6,3 and p 6,4 ⁇ 6,4 corresponding to the sixth spatial domain beam base vector are last arranged.
  • arrangement may be performed based on a descending order or ascending order of indexes of corresponding frequency-domain base vectors, for example, p 1,1 ⁇ 1,1 corresponding to the first frequency-domain base vector is first arranged, and then p 1,2 ⁇ 1,2 corresponding to the second frequency-domain base vector is arranged.
  • Solution 1 For the L*M-1 combination coefficients, amplitude quantization and phase quantization with equal precision are separately performed by using 3 bits. In this case, overheads required for reporting the amplitude value and the phase value of each of the L*M-1 combination coefficients in the reported precoding indication information are (L*M-1)*6.
  • Solution 2 For the L*M-1 combination coefficients, the average amplitude value corresponding to each spatial domain beam base vector is quantized by using 3 bits. Differential quantization is performed, by using 2 bits with reference to the average amplitude value, on the amplitude value of each combination coefficient corresponding to each spatial domain beam base vector. In this case, overheads required by the average amplitude values of all the spatial domain beam base vectors in the reported precoding indication information are L*3, and overheads required by differential quantized amplitude values of the L*M-1 combination coefficients are (L*M-1)*2. Each of the phase values of the L*M-1 combination coefficients is quantized by using 3 bits.
  • overheads required by the phase values of the L*M-1 combination coefficients are (L*M-1)*3. Therefore, in the solution 2, overheads required for reporting the amplitude value and the phase value of each of the L*M-1 combination coefficients are L*3+(L*M-1)*5.
  • the amplitude values of all the combination coefficients are quantized with equal precision by using the amplitude quantization bit quantity that is 3.
  • the phase value of the first combination coefficient group uses the phase quantization bit quantity that is 3, and the second combination coefficient group uses the phase quantization bit quantity that is 2.
  • grouping is performed based on the amplitude value, and the amplitude value uses a same quantization method.
  • the grouping status does not need to be additionally indicated, and the receive end may obtain the grouping status based on the amplitude values of all the combination coefficients according to the grouping method in 1.4. Therefore, in this solution, overheads required for reporting the amplitude value and the phase value of each of the L*M-1 combination coefficients are (L*M-1)*3+(L*M/2-1)*3+L*M/2*2.
  • all the amplitude values use a same amplitude quantization method, grouping is performed based on the amplitude value of each combination coefficient, and phase quantization used for each combination coefficient group may be different. Therefore, it can be ensured that reporting overheads are reduced while a system performance loss is minimized, and codebook compression efficiency is improved.
  • FIG. 3 is a schematic structural diagram of a precoding matrix indication apparatus according to an embodiment of this application.
  • the precoding matrix indication apparatus may be located in a transmit end.
  • the precoding matrix indication apparatus includes a determining unit 201, a grouping unit 202, and a sending unit 203.
  • the determining unit 201 and the grouping unit 202 may be a processing unit.
  • the determining unit 201 is configured to determine an amplitude value of each of K combination coefficients corresponding to each spatial layer, where the amplitude value of each combination coefficient is determined by using a same amplitude quantization bit quantity and a same amplitude quantization rule; K is a positive integer less than or equal to L*M; L is a total quantity of spatial domain beam base vectors that is determined by the transmit end; and M is a total quantity of frequency-domain base vectors that is determined by the transmit end.
  • the grouping unit 202 is configured to group the K combination coefficients based on the amplitude value of each of the K combination coefficients, to obtain Q combination coefficient groups, where Q is an integer greater than or equal to 2.
  • the determining unit 201 is further configured to determine a phase value of each combination coefficient in each combination coefficient group, where phase quantization bit quantities and/or phase quantization rules used by at least two of the Q combination coefficient groups are different.
  • the sending unit 203 is configured to send precoding matrix indication information, where the precoding matrix indication information includes the amplitude value and the phase value of each of the K combination coefficients.
  • that the grouping unit 202 groups the K combination coefficients based on the amplitude value of each of the K combination coefficients, to obtain the Q combination coefficient groups is specifically: grouping the K combination coefficients based on a descending order or ascending order of the amplitude values of all of the K combination coefficients, to obtain the Q combination coefficient groups.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the combination coefficients in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the combination coefficients in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • that the grouping unit 202 groups the K combination coefficients based on the amplitude value of each of the K combination coefficients, to obtain the Q combination coefficient groups is specifically: determining, in the K combination coefficients, one or more combination coefficients corresponding to each of l spatial domain beam base vectors, where l is a positive integer less than or equal to L; grouping the l spatial domain beam base vectors based on sum of amplitude value(s), a maximum amplitude value, or a sum of power of the one or more combination coefficients corresponding to each spatial domain beam base vector, to obtain Q spatial domain beam base vector groups; and for one or more spatial domain beam base vectors in each of the Q spatial domain beam base vector groups, determining all combination coefficients corresponding to the one or more spatial domain beam base vectors as one combination coefficient group, to obtain the Q combination coefficient groups corresponding to the Q spatial domain beam base vector groups.
  • sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each spatial domain beam base vector in a q 1 th spatial domain beam base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any spatial domain beam base vector in a q 2 th spatial domain beam base vector group corresponding to a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • that the grouping unit 202 groups the K combination coefficients based on the amplitude value of each of the K combination coefficients, to obtain the Q combination coefficient groups is specifically: determining, in the K combination coefficients, one or more combination coefficients corresponding to each of m frequency-domain base vectors, where m is a positive integer less than or equal to M; grouping the m frequency-domain base vectors based on sum of amplitude value(s), a maximum amplitude value, or a sum of power of the one or more combination coefficients corresponding to each frequency-domain base vector, to obtain Q frequency-domain base vector groups; and for one or more frequency-domain base vectors in each of the Q frequency-domain base vector groups, determining all combination coefficients corresponding to the one or more frequency-domain base vectors as one combination coefficient group, to obtain the Q combination coefficient groups corresponding to the Q frequency-domain base vector groups.
  • sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each frequency-domain base vector in a q 1 th frequency-domain base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any frequency-domain base vector in a q 2 th frequency-domain base vector group corresponding to a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • that the grouping unit 202 groups the K combination coefficients based on the amplitude value of each of the K combination coefficients, to obtain the Q combination coefficient groups is specifically: determining, in the K combination coefficients, one or more combination coefficients corresponding to each of l spatial domain beam base vectors, where l is a positive integer less than or equal to L; for the one or more combination coefficients corresponding to each spatial domain beam base vector, grouping the one or more combination coefficients based on a descending order or ascending order of an amplitude value of each combination coefficient, to obtain the Q combination coefficient groups corresponding to each spatial domain beam base vector; and combining a q th combination coefficient group corresponding to each of the l spatial domain beam base vectors, to obtain a q th combination coefficient group in the Q combination coefficient groups of the K combination coefficients, where q is an integer equal to 1, 2, ..., or Q.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • the amplitude value of each of the K combination coefficients is determined by performing quantization by using a quantization bit quantity A1, and A1 is an integer greater than or equal to 2.
  • the precoding matrix indication information further includes an average amplitude value or a maximum amplitude value corresponding to each of the l spatial domain beam base vector; l is a positive integer less than or equal to L; and the l spatial domain beam base vectors are spatial domain beam base vectors corresponding to all of the K combination coefficients; the amplitude value of each of the K combination coefficients is determined with reference to an average amplitude value or a maximum amplitude value of each spatial domain beam base vector corresponding to each combination coefficient and by performing differential quantization by using a quantization bit quantity A 3 ; A 3 is an integer greater than or equal to 1; and the average amplitude value or the maximum amplitude value of each spatial domain beam base vector is an average amplitude value or a maximum amplitude value of one or more combination coefficients corresponding to each spatial domain beam base vector in the K combination coefficients; and the average amplitude value or the maximum amplitude value corresponding to each spatial domain beam base vector is determined by performing quantization by using an amplitude quantization bit
  • the average amplitude values or the maximum amplitude values corresponding to all of the l spatial domain beam base vectors are located before the amplitude values of all of the K combination coefficients; and in the precoding matrix indication information, the average amplitude values or the maximum amplitude values corresponding to the spatial domain beam base vectors are arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors.
  • the amplitude values of all of the K combination coefficients are located before the phase values of all the combination coefficients;
  • the receiving unit 301 is configured to receive precoding matrix indication information, where the precoding matrix indication information includes an amplitude value and a phase value of each of K combination coefficients.
  • the determining unit 302 is configured to determine the amplitude value and the phase value of each of the K combination coefficients based on the precoding matrix indication information.
  • the amplitude value of each combination coefficient is determined by using a same amplitude quantization bit quantity and a same amplitude quantization rule; K is a positive integer less than or equal to L*M; L is a total quantity of spatial domain beam base vectors that is determined by the transmit end; and M is a total quantity of frequency-domain base vectors that is determined by the transmit end; and Q combination coefficient groups to which the K combination coefficients respectively belong are obtained through grouping based on the amplitude values of the K combination coefficients; the phase value of each combination coefficient is determined based on a phase quantization bit quantity and a phase quantization rule that are used by a combination coefficient group to which each combination coefficient belongs; and phase quantization bit quantities and/or phase quantization rules used by at least two of the Q combination coefficient groups are different.
  • the Q combination coefficient groups to which the K combination coefficients respectively belong are obtained by grouping the K combination coefficients based on a descending order or ascending order of the amplitude values of all of the K combination coefficients.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of combination coefficients in a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the combination coefficients in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the combination coefficients in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • each of the Q combination coefficient groups to which the K combination coefficients respectively belong includes all combination coefficients corresponding to spatial domain beam base vectors in each spatial domain beam base vector group; the spatial domain beam base vector groups are obtained by grouping l spatial domain beam base vectors based on sum of amplitude value(s), a maximum amplitude value, or a sum of power of one or more combination coefficients corresponding to each of the l spatial domain beam base vectors in the K combination coefficients; and l is a positive integer less than or equal to L.
  • sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each spatial domain beam base vector in a q 1 th spatial domain beam base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any spatial domain beam base vector in a q 2 th spatial domain beam base vector group corresponding to a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • each of the Q combination coefficient groups to which the K combination coefficients respectively belong includes all combination coefficients corresponding to frequency-domain base vectors in each of the Q frequency-domain base vector groups; the Q frequency-domain base vector groups are obtained by grouping the M frequency-domain base vectors based on sum of amplitude value(s), a maximum amplitude value, or a sum of power of one or more combination coefficients corresponding to each of m frequency-domain base vectors in the K combination coefficients; and m is a positive integer less than or equal to M.
  • sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to each frequency-domain base vector in a q 1 th frequency-domain base vector group corresponding to a q 1 th combination coefficient group are respectively greater than sum of amplitude value(s), a maximum amplitude value, and a sum of power of a combination coefficient corresponding to any frequency-domain base vector in a q 2 th frequency-domain base vector group corresponding to a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by each combination coefficient in the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by each combination coefficient in the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • a q th combination coefficient group in the Q combination coefficient groups to which the K combination coefficients respectively belong is obtained by combining combination coefficient (s) in a q th combination coefficient group in Q combination coefficient groups corresponding to each of l spatial domain beam base vectors; l is a positive integer less than or equal to L; and q is an integer equal to 1, 2, ..., or Q; and the Q combination coefficient groups corresponding to each of the l spatial domain beam base vectors are obtained by grouping, for one or more combination coefficients corresponding to each spatial domain beam base vector, the one or more combination coefficients based on a descending order or ascending order of an amplitude value of each combination coefficient.
  • a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 1 th combination coefficient group is greater than a minimum amplitude value, a maximum amplitude value, or sum of amplitude value(s) of a q 2 th combination coefficient group;
  • a phase quantization bit quantity B q1 used by the q 1 th combination coefficient group is greater than a phase quantization bit quantity B q2 used by the q 2 th combination coefficient group;
  • q 1 is not equal to q 2 ; and
  • q 1 and q 2 are integers greater than or equal to 1 and less than or equal to Q.
  • the amplitude value of each of the K combination coefficients is determined by performing quantization by using a quantization bit quantity A1, and A1 is an integer greater than or equal to 2.
  • the precoding matrix indication information further includes an average amplitude value or a maximum amplitude value corresponding to each of the l spatial domain beam base vector; l is a positive integer less than or equal to L; and the l spatial domain beam base vectors are spatial domain beam base vectors corresponding to all of the K combination coefficients;
  • the average amplitude values or the maximum amplitude values corresponding to all of the l spatial domain beam base vectors are located before the amplitude values of all of the K combination coefficients; and the average amplitude values or the maximum amplitude values corresponding to the spatial domain beam base vectors are arranged based on a descending order or ascending order of indexes of the spatial domain beam base vectors.
  • the amplitude values of all of the K combination coefficients are located before the phase values of all the combination coefficients;
  • FIG. 5 is a schematic diagram of a device according to an embodiment of this application.
  • the device may be a terminal device, or may be a chip or a circuit, for example, a chip or a circuit that can be disposed in a terminal device.
  • the device may correspond to a related operation of the transmit end in the foregoing method.
  • the device may include a processor 410 and a memory 420.
  • the memory 420 is configured to store instructions
  • the processor 410 is configured to execute the instructions stored in the memory 420, to implement the steps performed by the transmit end, or implement related operations performed by the units in the precoding matrix indication apparatus shown in FIG. 3 .
  • the device may include a receiver 440 and a transmitter 450. Further, the device may further include a bus system 430. The processor 410, the memory 420, the receiver 440, and the transmitter 450 may be connected by using the bus system 430.
  • the processor 410 is configured to execute the instructions stored in the memory 420, to control the receiver 440 to receive a signal and control the transmitter 450 to send a signal, to complete the steps of the transmit end in the foregoing method, for example, sending the precoding matrix indication information.
  • the receiver 440 and the transmitter 450 may be a same physical entity or different physical entities. When the receiver 440 and the transmitter 450 are a same physical entity, the receiver 440 and the transmitter 450 may be collectively referred to as a transceiver.
  • the memory 420 may be integrated into the processor 410, or may be disposed separately from the processor 410.
  • the memory 420 is further configured to store the predefined information in the foregoing method embodiment, or information notified by a network device such as a base station.
  • functions of the receiver 440 and the transmitter 450 are implemented by using a transceiver circuit or a dedicated transceiver chip. It may be considered that the processor 410 is implemented by using a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.
  • a related operation of the transmit end is implemented by using a general-purpose computer.
  • program code for implementing functions of the processor 410, the receiver 440, and the transmitter 450 is stored in the memory.
  • a general-purpose processor implements the functions of the processor 410, the receiver 440, and the transmitter 450 by executing the code in the memory.
  • the processor 410 invokes the program code in the memory 420, to perform a related operation of the transmit end in the foregoing method embodiment.
  • FIG. 6 is a schematic structural diagram of a terminal device according to an embodiment of this application.
  • the terminal device may be applied to the system shown in FIG. 1 .
  • FIG. 6 shows only main components of the terminal device.
  • the terminal device includes a processor, a memory, a control circuit, an antenna, and an input/output apparatus.
  • the processor is mainly configured to: process a communication protocol and communication data, control the entire terminal device, execute a software program, and process data of the software program, for example, configured to support the terminal device in performing an action of the transmit end that is described in the foregoing method embodiment.
  • the memory is mainly configured to store the software program and the data, for example, the predefined information in the foregoing method embodiment, or information notified by a network device such as a base station.
  • the control circuit is mainly configured to: perform conversion between a baseband signal and a radio frequency signal, and process the radio frequency signal.
  • the control circuit and the antenna may also be collectively referred to as a transceiver, and are mainly configured to receive and send a radio frequency signal in a form of an electromagnetic wave, for example, receive channel state measurement information configured by the network device, and send precoding matrix indication information to the network device.
  • the input/output apparatus such as a touchscreen, a display screen, or a keyboard, is mainly configured to: receive data entered by a user, and output data to the user.
  • the processor may read a software program in a storage unit, interpret and execute an instruction of the software program, and process data of the software program, for example, perform a related operation of the transmit end in the foregoing method embodiment.
  • the processor when the processor needs to wirelessly send data, after performing baseband processing on to-be-sent data, the processor outputs a baseband signal to a radio frequency circuit; and the radio frequency circuit performs radio frequency processing on the baseband signal and then sends a radio frequency signal to the outside in a form of an electromagnetic wave through the antenna.
  • the radio frequency circuit When data is sent to the terminal device, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor.
  • the processor converts the baseband signal into data, and processes the data.
  • FIG. 6 shows only one memory and one processor.
  • An actual terminal device may have a plurality of processors and a plurality of memories.
  • the memory may also be referred to as a storage medium, a storage device, or the like. This is not limited in this embodiment of the present invention.
  • the processor may include a baseband processor and a central processing unit.
  • the baseband processor is mainly configured to process a communications protocol and communication data.
  • the central processing unit is mainly configured to: control the entire terminal device, execute a software program, and process data of the software program.
  • the processor in FIG. 6 integrates functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit may be processors independent of each other, and are interconnected by using technologies such as a bus.
  • the terminal device may include a plurality of baseband processors to adapt to different network standards, the terminal device may include a plurality of central processing units to improve a processing capability of the terminal device, and components of the terminal device may be connected by using various buses.
  • the baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit may also be expressed as a central processing circuit or a central processing chip.
  • a function of processing the communications protocol and the communication data may be built in the processor, or may be stored in the storage unit in a form of a software program.
  • the processor executes the software program, to implement a baseband processing function.
  • the antenna having a transceiver function and the control circuit may be considered as a communications unit or a transceiver unit of the terminal device, and the processor having a processing function may be considered as a determining unit or a processing unit of the terminal device.
  • the terminal device includes a transceiver unit 501 and a processing unit 502.
  • the transceiver unit may also be referred to as a transceiver, a transceiver machine, a transceiver apparatus, or the like.
  • a component that is in the transceiver unit 501 and that is configured to implement a receiving function may be considered as a receiving unit
  • a component that is in the transceiver unit 501 and that is configured to implement a sending function may be considered as a sending unit
  • the transceiver unit 501 includes the receiving unit and the sending unit.
  • the receiving unit may also be referred to as a receiver, a receiving circuit, or the like
  • the sending unit may be referred to as a transmitter, a transmitting circuit, or the like.
  • FIG. 7 is a schematic structural diagram of a device according to an embodiment of this application.
  • the device may be a network device; or the device may be a chip or a circuit, for example, a chip or a circuit that can be disposed in a receive end.
  • the device performs a related operation of the receive end in the foregoing method.
  • the device may include a processor 610 and a memory 620.
  • the memory 620 is configured to store instructions
  • the processor 610 is configured to execute the instructions stored in the memory 620, to enable the device to implement a related operation of the receive end, for example, receiving precoding matrix indication information and determining an amplitude value and a phase value of each combination coefficient.
  • the network device may further include a receiver 640 and a transmitter 650. Further, the network device may further a bus system 630.
  • the processor 610, the memory 620, the receiver 640, and the transmitter 650 are connected through the bus system 630.
  • the processor 610 is configured to execute the instructions stored in the memory 620, to control the receiver 640 to receive a signal and control the transmitter 650 to send the signal, to complete the steps of the network device in the foregoing methods.
  • the receiver 640 and the transmitter 650 may be a same physical entity or different physical entities. When the receiver 640 and the transmitter 650 are a same physical entity, the receiver 640 and the transmitter 650 may be collectively referred to as a transceiver.
  • the memory 620 may be integrated into the processor 610, or may be disposed separately from the processor 610.
  • functions of the receiver 640 and the transmitter 650 are implemented by using a transceiver circuit or a dedicated transceiver chip. It may be considered that the processor 610 is implemented by using a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.
  • a related operation of the receive end is implemented by using a general-purpose computer.
  • program code for implementing functions of the processor 610, the receiver 640, and the transmitter 650 is stored in the memory.
  • a general-purpose processor implements the functions of the processor 610, the receiver 640, and the transmitter 650 by executing the code in the memory.
  • the processor 610 may invoke the program code in the memory 620, or a computer or a network device performs, based on the receiver 640 and the transmitter 650, related operations of the receiving unit, the determining unit, and the like in the embodiment shown in FIG. 4 , or may perform a related operation or implementation performed by the receive end in the foregoing method embodiment.
  • FIG. 8 is a schematic structural diagram of a network device according to an embodiment of this application.
  • the network device may be a base station, and may perform a related operation of the receive end in the foregoing method embodiment, for example, operations of sending measurement configuration information of related channel state information to a terminal device, and receiving precoding matrix indication information reported by the terminal device.
  • a structure of a base station is used as an example for description in FIG. 8 .
  • the base station may be applied to the system shown in FIG. 1 .
  • the base station includes one or more radio frequency units, such as a remote radio unit (remote radio unit, RRU) 701 and one or more baseband units (baseband unit, BBU) (which may also be referred to as a digital unit (digital unit, DU)) 702.
  • the RRU 701 may be referred to as a transceiver unit, a transceiver machine, a transceiver circuit, a transceiver, or the like, and may include at least one antenna 7011 and a radio frequency unit 7012.
  • the RRU 701 is mainly configured to: send and receive a radio frequency signal and perform conversion between a radio frequency signal and a baseband signal.
  • the RRU 701 is configured to receive the precoding matrix indication information reported by the terminal device in the foregoing embodiments.
  • the BBU 702 is mainly configured to: perform baseband processing, control the base station, and so on.
  • the RRU 701 and the BBU 702 may be physically disposed together, or may be physically separated, namely, a distributed base station.
  • the BBU 702 is a control center of the base station, may also be referred to as a processing unit, and is mainly configured to complete a baseband processing function such as channel coding, multiplexing, modulation, or spectrum spreading.
  • the BBU processing unit
  • the BBU may be configured to control the base station to perform an operation procedure of the receive end in the foregoing method embodiment.
  • the BBU 702 may include one or more boards, and a plurality of boards may jointly support a radio access network of a single access standard (such as an LTE network), or may separately support radio access networks of different access standards.
  • the BBU 702 further includes a memory 7021 and a processor 7022.
  • the memory 7021 is configured to store necessary instructions and data.
  • the memory 7021 stores predefined content in the foregoing embodiments.
  • the processor 7022 is configured to control the base station to perform necessary actions.
  • the processor 7022 is configured to control the base station to perform an operation procedure related to the receive end in the foregoing method embodiment.
  • the memory 7021 and the processor 7022 may serve one or more boards. In other words, a memory and a processor may be independently disposed on each board. Alternatively, a plurality of boards may share a same memory and a same processor. In addition, a necessary circuit may be further disposed on each board.
  • an embodiment of this application further provides a communications system, including the foregoing receive end and one or more transmit ends.
  • the processor may be a central processing unit (Central Processing Unit, "CPU” for short), or the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or another programmable logic device, a discrete gate or a transistor logic device, a discrete hardware component, or the like.
  • the general-purpose processor may be a microprocessor, or the processor may be any conventional processor or the like.
  • the memory may include a read-only memory and a random access memory, and provide instructions and data to the processor.
  • a part of the memory may further include a non-volatile random access memory.
  • the bus system may further include a power bus, a control bus, a status signal bus, and the like.
  • a power bus may further include a power bus, a control bus, a status signal bus, and the like.
  • various types of buses in the figure are marked as the bus system.
  • this application further provides a computer-readable storage medium.
  • the computer-readable storage medium stores computer instructions.
  • the computer instructions When the computer instructions are run on a computer, the computer is enabled to perform a corresponding operation and/or procedure performed by the transmit end in the precoding matrix indication method in the embodiments of this application, or the computer is enabled to perform a corresponding operation and/or procedure performed by the receive end in the precoding matrix indication method in the embodiments of this application.
  • This application further provides a computer program product.
  • the computer program product includes computer program code.
  • the computer program code When the computer program code is run on a computer, the computer is enabled to perform a corresponding operation and/or procedure performed by the transmit end in the precoding matrix indication method in the embodiments of this application, or the computer is enabled to perform a corresponding operation and/or procedure performed by the receive end in the precoding matrix indication method in the embodiments of this application.
  • This application further provides a chip, including a processor.
  • the processor is configured to invoke and run a computer program stored in a memory, to perform a corresponding operation and/or procedure performed by the transmit end in the precoding matrix indication method in the embodiments of this application, or perform a corresponding operation and/or procedure performed by the receive end in the precoding matrix indication method in the embodiments of this application.
  • the chip further includes the memory.
  • the memory is connected to the processor through a circuit or a cable.
  • the processor is configured to read and execute the computer program in the memory.
  • the chip further includes a communications interface.
  • the processor is connected to the communications interface.
  • the communications interface is configured to receive data and/or information that need/needs to be processed.
  • the processor obtains the data and/or the information from the communications interface, and processes the data and/or the information.
  • the communications interface may be an input/output interface.
  • steps in the foregoing methods may be implemented by using a hardware integrated logic circuit in the processor, or by using instructions in a form of software.
  • the steps of the methods disclosed with reference to the embodiments of this application may be directly performed by a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, or a register.
  • the storage medium is located in the memory, and the processor reads information in the memory and completes the steps in the foregoing methods in combination with hardware of the processor. To avoid repetition, details are not described herein again.
  • sequence numbers of the foregoing processes do not mean execution sequences.
  • the execution sequences of the processes should be determined based on functions and internal logic of the processes, and should not be construed as any limitation on the implementation processes of the embodiments of the present invention.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the described apparatus embodiment is merely an example.
  • the unit division is merely logical function division and may be other division during actual implementation.
  • a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed.
  • the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented by using some interfaces.
  • the indirect couplings or communication connections between the apparatuses or units may be implemented in electrical, mechanical, or other forms.
  • the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units may be selected based on actual requirements to achieve the objectives of the solutions in the embodiments.
  • functional units in the embodiments of the present invention may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit.
  • All or some of the foregoing embodiments may be implemented by using software, hardware, firmware, or any combination thereof.
  • the embodiments may be implemented completely or partially in a form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, or another programmable apparatus.
  • the computer instructions may be stored in a computer-readable storage medium or may be transmitted from a computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired (for example, a coaxial cable, an optical fiber, or a digital subscriber line (DSL)) or wireless (for example, infrared, radio, or microwave) manner.
  • the computer-readable storage medium may be any usable medium accessible by a computer, or a data storage device, such as a server or a data center, integrating one or more usable media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a DVD), a semiconductor medium (for example, a solid-state drive Solid State Disk (SSD)), or the like.
  • a magnetic medium for example, a floppy disk, a hard disk, or a magnetic tape
  • an optical medium for example, a DVD
  • a semiconductor medium for example, a solid-state drive Solid State Disk (SSD)

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US12088377B2 (en) * 2019-02-15 2024-09-10 Qualcomm Incorporated Coefficient indication for channel state information
US20220311489A1 (en) * 2019-08-05 2022-09-29 Cohere Technologies, Inc. Spectral sharing wireless systems
WO2022198471A1 (zh) * 2021-03-24 2022-09-29 华为技术有限公司 一种信息反馈方法以及相关装置
US11777647B2 (en) * 2021-06-30 2023-10-03 Electronics And Telecommunications Research Institute Method and apparatus for traffic transmission in communication system
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US10742290B2 (en) * 2017-04-13 2020-08-11 Samsung Electronics Co., Ltd. High-resolution CSI reporting based on unequal bit allocation in advanced wireless communication systems
CN108418612B (zh) * 2017-04-26 2019-03-26 华为技术有限公司 一种指示及确定预编码向量的方法和设备
US10298311B2 (en) * 2017-05-02 2019-05-21 Mediatek Inc. Overhead reduction for linear combination codebook and feedback mechanism in mobile communications
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